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  1. fn main() {
  2.     let mut c = std::collections::HashMap::new();
  3.     for &i in &vec![3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5] {
  4.         *(c.entry(i).or_insert(0)) += 1;
  5.     }
  6.     println!("c = {:?}", c);
  7.     let num_of_five = *c.get(&5).unwrap_or(&0);
  8.     println!("num_of_five = {}", num_of_five);
  9.     *(c.entry(3).or_insert(0)) += 57;
  10.     println!("c = {:?}", c);
  11. }
  12.  
Success #stdin #stdout 0s 4536KB
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Standard input is empty
stdout
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c = {3: 2, 6: 1, 4: 1, 9: 1, 1: 2, 2: 1, 5: 3}
num_of_five = 3
c = {3: 59, 6: 1, 4: 1, 9: 1, 1: 2, 2: 1, 5: 3}
https://ideone.com/dPyEF0
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language:
Rust (rust 1.56)
created:
4 years ago
visibility:
public

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